Euphytica

, Volume 164, Issue 1, pp 1–11

Genetic diversity among coconut varieties for susceptibility to Cape St Paul Wilt Disease

  • S. K. Dery
  • R. Philippe
  • L. Baudouin
  • R. N. Quaicoe
  • J. Nkansah-Poku
  • J. Owusu-Nipah
  • R. Arthur
  • D. Dare
  • N. Yankey
  • M. Dollet
Review

Abstract

The CSPWD is the Ghanaian form of lethal yellowing disease (LYD) of coconut, caused by a phytoplasma and has been active in Ghana since 1932. The paper updates the results of screening trials conducted with 38 pure and hybrid coconut varieties since 1981. Although no variety was found totally resistant, a wide range of susceptibility level was observed: almost all SGD were still unaffected, while the local WAT had almost totally disappeared, additive values were calculated for the parental varieties and it was shown that, in the average, hybrids are slightly more susceptible than predicted by a purely additive model. According to this genetic model, the SGD × VTT hybrid will be appreciably less susceptible than the MYD × VTT currently being used for replanting devastated farms in Ghana. Our results tend to confirm the general trend that cultivars from the Pacific group (especially the Dwarfs) are less susceptible than the Indo-Atlantic cultivars. Proposals are made to adapt planting material to the risk level. Genetic control can only be efficient if it is considered as a link in a chain of control measures involving the choice of a proper planting site, good management and early eradication of diseased trees.

Keywords

Coconut Ghana Lethal yellowing Screening Varieties 

Abbreviations

ADOT

Andaman Tall

CATD

Catigan Green Dwarf

CRD

Cameroon Red Dwarf

EGD

Equatorial Guinean Green Dwarf (synonym to the Brazilian Green Dwarf)

LCT

Laccadive Tall

MRD

Malayan Red Dwarf

MYD

Malayan Yellow Dwarf

MLT

Malayan Tall

PNT

Panama Tall

RIT

Rennell Island Tall

SGD

Sri Lanka Green Dwarf

TACD

Tacunan Green Dwarf

TAGT

Tagnanan Tall

TAT

Tahiti Tall (synonym to the Polynesian Tall)

VTT

Vanuatu Tall

WAT

West African Tall

Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  • S. K. Dery
    • 1
  • R. Philippe
    • 2
  • L. Baudouin
    • 2
  • R. N. Quaicoe
    • 1
  • J. Nkansah-Poku
    • 1
  • J. Owusu-Nipah
    • 1
  • R. Arthur
    • 3
  • D. Dare
    • 1
  • N. Yankey
    • 1
  • M. Dollet
    • 2
  1. 1.OPRISekondiGhana
  2. 2.CIRADMontpellier Cedex 5France
  3. 3.CSDPSekondiGhana

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